IBM SECURITY ADVISORY First Issued: Tue Aug 14 14:48:57 CDT 2018 The most recent version of this document is available here: http://aix.software.ibm.com/aix/efixes/security/ntp_advisory10.asc https://aix.software.ibm.com/aix/efixes/security/ntp_advisory10.asc ftp://aix.software.ibm.com/aix/efixes/security/ntp_advisory10.asc Security Bulletin: Vulnerabilities in NTP affect AIX =============================================================================== SUMMARY: There are multiple vulnerabilities in NTPv3 and NTPv4 that affect AIX. =============================================================================== VULNERABILITY DETAILS: NTPv3 is vulnerable to: CVEID: CVE-2014-5209 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-5209 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-5209 DESCRIPTION: NTP could allow a remote attacker to obtain sensitive information. By sending a GET_RESTRICT control message, an attacker could exploit this vulnerability to obtain internal or alternative IP addresses and other sensitive information. CVSS Base Score: 5.0 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/95841 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (AV:N/AC:L/Au:N/C:P/I:N/A:N) NTPv3 and NTPv4 are vulnerable to: CVEID: CVE-2018-7182 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-7182 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-7182 DESCRIPTION: NTP could allow a remote attacker to obtain sensitive information, caused by a leak in the ctl_getitem() function. By sending a specially crafted mode 6 packet, an attacker could exploit this vulnerability to read past the end of its buffer. CVSS Base Score: 5.3 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/139785 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N) CVEID: CVE-2018-7183 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-7183 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-7183 DESCRIPTION: NTP is vulnerable to a buffer overflow, caused by improper bounds checking by the decodearr function. By leveraging an ntpq query and sending a response with a crafted array, a remote attacker could overflow a buffer and execute arbitrary code on the system or cause the application to crash. CVSS Base Score: 5.6 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/140092 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L) NTPv4 is vulnerable to: CVEID: CVE-2018-7170 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-7170 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-7170 DESCRIPTION: NTP could allow a remote authenticated attacker to bypass security restrictions, caused by a Sybil attack. By creating many ephemeral associations, an attacker could exploit this vulnerability to win the clock selection of ntpd and modify a victim's clock. CVSS Base Score: 3.1 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/139786 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N) CVEID: CVE-2018-7184 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-7184 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-7184 DESCRIPTION: NTP is vulnerable to a denial of service, caused by the failure of the interleaved symmetric mode to recover from bad state. By sending specially crafted packets, a remote authenticated attacker could exploit this vulnerability to cause a denial of service. CVSS Base Score: 3.1 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/139784 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L) CVEID: CVE-2018-7185 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-7185 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-7185 DESCRIPTION: NTP is vulnerable to a denial of service. By sending specially crafted packets, a remote authenticated attacker could exploit this vulnerability to reset authenticated interleaved association. CVSS Base Score: 3.1 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/139783 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L) CVEID: CVE-2016-1549 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-1549 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-1549 DESCRIPTION: NTP could allow a remote authenticated attacker to bypass security restrictions, caused by the failure to prevent Sybil attacks from authenticated peers. By creating multiple ephemeral associations to win the clock selection of ntpd, an attacker could exploit this vulnerability to modify a victim's clock. CVSS Base Score: 5.3 CVSS Temporal Score: See https://exchange.xforce.ibmcloud.com/vulnerabilities/112741 for the current score CVSS Environmental Score*: Undefined CVSS Vector: (CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N) AFFECTED PRODUCTS AND VERSIONS: AIX 5.3, 6.1, 7.1, 7.2 VIOS 2.2.x The vulnerabilities in the following filesets are being addressed: key_fileset = aix For NTPv3: Fileset Lower Level Upper Level KEY PRODUCT(S) --------------------------------------------------------------------- bos.net.tcp.client 5.3.12.0 5.3.12.10 key_w_fs NTPv3 bos.net.tcp.client 6.1.9.0 6.1.9.315 key_w_fs NTPv3 bos.net.tcp.client 7.1.4.0 7.1.4.33 key_w_fs NTPv3 bos.net.tcp.client 7.1.5.0 7.1.5.15 key_w_fs NTPv3 bos.net.tcp.ntpd 7.2.0.0 7.2.0.4 key_w_fs NTPv3 bos.net.tcp.ntpd 7.2.1.0 7.2.1.2 key_w_fs NTPv3 bos.net.tcp.ntpd 7.2.2.0 7.2.2.15 key_w_fs NTPv3 For NTPv4: Fileset Lower Level Upper Level KEY PRODUCT(S) --------------------------------------------------------------------- ntp.rte 7.4.2.8100 7.4.2.8100 key_w_fs NTPv4 To find out whether the affected filesets are installed on your systems, refer to the lslpp command found in AIX user's guide. Example: lslpp -L | grep -i bos.net.tcp.client REMEDIATION: A. APARS IBM has assigned the following APARs to this problem: For NTPv3: AIX Level APAR Availability SP KEY PRODUCT(S) ------------------------------------------------------------ 5.3.12 IJ06657 ** N/A key_w_apar NTPv3 6.1.9 IJ06651 ** SP12 key_w_apar NTPv3 7.1.4 IJ06652 ** SP7 key_w_apar NTPv3 7.1.5 IJ06653 ** SP3 key_w_apar NTPv3 7.2.0 IJ06654 ** N/A key_w_apar NTPv3 7.2.1 IJ06655 ** SP5 key_w_apar NTPv3 7.2.2 IJ06656 ** SP3 key_w_apar NTPv3 VIOS Level APAR Availability SP KEY PRODUCT(S) ---------------------------------------------------------------- 2.2.4 IJ06651 ** N/A key_w_apar NTPv3 2.2.5 IJ06651 ** 2.2.5.50 key_w_apar NTPv3 2.2.6 IJ06651 ** 2.2.6.30 key_w_apar NTPv3 For NTPv4: AIX Level APAR Availability SP KEY PRODUCT(S) ------------------------------------------------------------ 6.1.9 IJ06400 ** SP12 key_w_apar NTPv4 7.1.4 IJ06400 ** SP7 key_w_apar NTPv4 7.1.5 IJ06400 ** SP3 key_w_apar NTPv4 7.2.0 IJ06400 ** N/A key_w_apar NTPv4 7.2.1 IJ06400 ** SP5 key_w_apar NTPv4 7.2.2 IJ06400 ** SP3 key_w_apar NTPv4 VIOS Level APAR Availability SP KEY PRODUCT(S) ---------------------------------------------------------------- 2.2.4 IJ06400 ** N/A key_w_apar NTPv4 2.2.5 IJ06400 ** 2.2.5.50 key_w_apar NTPv4 2.2.6 IJ06400 ** 2.2.6.30 key_w_apar NTPv4 Subscribe to the APARs here: http://www.ibm.com/support/docview.wss?uid=isg1IJ06400 http://www.ibm.com/support/docview.wss?uid=isg1IJ06651 http://www.ibm.com/support/docview.wss?uid=isg1IJ06652 http://www.ibm.com/support/docview.wss?uid=isg1IJ06653 http://www.ibm.com/support/docview.wss?uid=isg1IJ06654 http://www.ibm.com/support/docview.wss?uid=isg1IJ06655 http://www.ibm.com/support/docview.wss?uid=isg1IJ06656 https://www.ibm.com/support/docview.wss?uid=isg1IJ06400 https://www.ibm.com/support/docview.wss?uid=isg1IJ06651 https://www.ibm.com/support/docview.wss?uid=isg1IJ06652 https://www.ibm.com/support/docview.wss?uid=isg1IJ06653 https://www.ibm.com/support/docview.wss?uid=isg1IJ06654 https://www.ibm.com/support/docview.wss?uid=isg1IJ06655 https://www.ibm.com/support/docview.wss?uid=isg1IJ06656 By subscribing, you will receive periodic email alerting you to the status of the APAR, and a link to download the fix once it becomes available. B. FIXES AIX and VIOS fixes are available. The AIX/VIOS fixes can be downloaded via ftp or http from: ftp://aix.software.ibm.com/aix/efixes/security/ntp_fix10.tar http://aix.software.ibm.com/aix/efixes/security/ntp_fix10.tar https://aix.software.ibm.com/aix/efixes/security/ntp_fix10.tar The link above is to a tar file containing this signed advisory, fix packages, and OpenSSL signatures for each package. The fixes below include prerequisite checking. This will enforce the correct mapping between the fixes and AIX Technology Levels. For NTPv3: AIX Level Interim Fix (*.Z) KEY PRODUCT(S) ---------------------------------------------------------- 5.3.12.9 IJ06657m9a.180529.epkg.Z key_w_fix NTPv3 6.1.9.9 IJ06651m9a.180528.epkg.Z key_w_fix NTPv3 6.1.9.10 IJ06651m9a.180528.epkg.Z key_w_fix NTPv3 6.1.9.11 IJ06651m9a.180528.epkg.Z key_w_fix NTPv3 7.1.4.4 IJ06652m4a.180528.epkg.Z key_w_fix NTPv3 7.1.4.5 IJ06652m4a.180528.epkg.Z key_w_fix NTPv3 7.1.4.6 IJ06652m4a.180528.epkg.Z key_w_fix NTPv3 7.1.5.0 IJ06653m0a.180527.epkg.Z key_w_fix NTPv3 7.1.5.1 IJ06653m0a.180527.epkg.Z key_w_fix NTPv3 7.1.5.2 IJ06653m0a.180527.epkg.Z key_w_fix NTPv3 7.2.0.4 IJ06654m4a.180527.epkg.Z key_w_fix NTPv3 7.2.0.5 IJ06654m4a.180527.epkg.Z key_w_fix NTPv3 7.2.0.6 IJ06654m4a.180527.epkg.Z key_w_fix NTPv3 7.2.1.2 IJ06655m2a.180527.epkg.Z key_w_fix NTPv3 7.2.1.3 IJ06655m2a.180527.epkg.Z key_w_fix NTPv3 7.2.1.4 IJ06655m2a.180527.epkg.Z key_w_fix NTPv3 7.2.2.0 IJ06656m0a.180527.epkg.Z key_w_fix NTPv3 7.2.2.1 IJ06656m0a.180527.epkg.Z key_w_fix NTPv3 7.2.2.2 IJ06656m0a.180527.epkg.Z key_w_fix NTPv3 Please note that the above table refers to AIX TL/SP level as opposed to fileset level, i.e., 7.2.2.2 is AIX 7200-02-02. VIOS Level Interim Fix (*.Z) KEY PRODUCT(S) ----------------------------------------------------------- 2.2.4.40 IJ06651m9a.180528.epkg.Z key_w_fix NTPv3 2.2.4.50 IJ06651m9a.180528.epkg.Z key_w_fix NTPv3 2.2.4.60 IJ06651m9a.180528.epkg.Z key_w_fix NTPv3 2.2.5.20 IJ06651m9a.180528.epkg.Z key_w_fix NTPv3 2.2.5.30 IJ06651m9a.180528.epkg.Z key_w_fix NTPv3 2.2.5.40 IJ06651m9a.180528.epkg.Z key_w_fix NTPv3 2.2.6.0 IJ06651m9a.180528.epkg.Z key_w_fix NTPv3 2.2.6.10 IJ06651m9a.180528.epkg.Z key_w_fix NTPv3 2.2.6.2x IJ06651m9a.180528.epkg.Z key_w_fix NTPv3 For NTPv4: AIX Level Interim Fix (*.Z) KEY PRODUCT(S) ---------------------------------------------------------- 6.1.x IJ06400s9a.180514.epkg.Z key_w_fix NTPv4 7.1.x IJ06400s9a.180514.epkg.Z key_w_fix NTPv4 7.2.x IJ06400s9a.180514.epkg.Z key_w_fix NTPv4 VIOS Level Interim Fix (*.Z) KEY PRODUCT(S) ----------------------------------------------------------- 2.2.x IJ06400s9a.180514.epkg.Z key_w_fix NTPv4 To extract the fixes from the tar file: tar xvf ntp_fix10.tar cd ntp_fix10 Verify you have retrieved the fixes intact: The checksums below were generated using the "openssl dgst -sha256 file" command as the following: openssl dgst -sha256 filename KEY ----------------------------------------------------------------------------------------------------- 456eefb0975171e71cedd71431b6e23ebf16b226c4344a34b9c6452cb862fc42 IJ06400s9a.180514.epkg.Z key_w_csum e17cc1dc210f3b8f802d4b52cda05f1a89cd6de2cea371e9a7bea5452dd686f5 IJ06651m9a.180528.epkg.Z key_w_csum 3c92a6063d36be79cd716843fc8221f96911922a62b91a20e86d10ead054255a IJ06652m4a.180528.epkg.Z key_w_csum 17f7a37fedba73dd7e3862ced003436b22c5b74c7ca8dcc0dcde3306cff0d64f IJ06653m0a.180527.epkg.Z key_w_csum 7792b56540634644b2fb9b47a8d5449eb62a89ea83e965e265d5b3fe3a2d01bd IJ06654m4a.180527.epkg.Z key_w_csum 223874b300b8a4201c6f6cdc0eb53bc09e4c22f9f00902713143b3df3569e0c0 IJ06655m2a.180527.epkg.Z key_w_csum f0e0c59274a89dc18064f8e49d4fa47de870e94b3b2d84d841f2e41c890cd035 IJ06656m0a.180527.epkg.Z key_w_csum 4a8e6ba8e5f5bf6651c339ee8ccffbcf6cd50f5004f1598d0ac70ecfe58ee823 IJ06657m9a.180529.epkg.Z key_w_csum These sums should match exactly. The OpenSSL signatures in the tar file and on this advisory can also be used to verify the integrity of the fixes. If the sums or signatures cannot be confirmed, contact IBM Support at http://ibm.com/support/ and describe the discrepancy. openssl dgst -sha1 -verify [pubkey_file] -signature [advisory_file].sig [advisory_file] openssl dgst -sha1 -verify [pubkey_file] -signature [ifix_file].sig [ifix_file] Published advisory OpenSSL signature file location: http://aix.software.ibm.com/aix/efixes/security/ntp_advisory10.asc.sig https://aix.software.ibm.com/aix/efixes/security/ntp_advisory10.asc.sig ftp://aix.software.ibm.com/aix/efixes/security/ntp_advisory10.asc.sig C. FIX AND INTERIM FIX INSTALLATION If possible, it is recommended that a mksysb backup of the system be created. Verify it is both bootable and readable before proceeding. The fix will not take affect until any running xntpd servers have been stopped and restarted with the following commands: stopsrc -s xntpd startsrc -s xntpd To preview a fix installation: installp -a -d fix_name -p all # where fix_name is the name of the # fix package being previewed. To install a fix package: installp -a -d fix_name -X all # where fix_name is the name of the # fix package being installed. After installation the ntp daemon must be restarted: stopsrc -s xntpd startsrc -s xntpd Interim fixes have had limited functional and regression testing but not the full regression testing that takes place for Service Packs; however, IBM does fully support them. Interim fix management documentation can be found at: http://www14.software.ibm.com/webapp/set2/sas/f/aix.efixmgmt/home.html To preview an interim fix installation: emgr -e ipkg_name -p # where ipkg_name is the name of the # interim fix package being previewed. To install an interim fix package: emgr -e ipkg_name -X # where ipkg_name is the name of the # interim fix package being installed. WORKAROUNDS AND MITIGATIONS: None. =============================================================================== CONTACT US: Note: Keywords labeled as KEY in this document are used for parsing purposes. If you would like to receive AIX Security Advisories via email, please visit "My Notifications": http://www.ibm.com/support/mynotifications To view previously issued advisories, please visit: http://www14.software.ibm.com/webapp/set2/subscriptions/onvdq Contact IBM Support for questions related to this announcement: http://ibm.com/support/ https://ibm.com/support/ To obtain the OpenSSL public key that can be used to verify the signed advisories and ifixes: Download the key from our web page: ftp://ftp.software.ibm.com/systems/power/AIX/systems_p_os_aix_security_pubkey.txt Please contact your local IBM AIX support center for any assistance. REFERENCES: Complete CVSS v3 Guide: http://www.first.org/cvss/user-guide On-line Calculator v3: http://www.first.org/cvss/calculator/3.0 RELATED INFORMATION: IBM Secure Engineering Web Portal http://www.ibm.com/security/secure-engineering/bulletins.html IBM Product Security Incident Response Blog https://www.ibm.com/blogs/psirt/ Security Bulletin: Vulnerabilities in NTP affect AIX https://www-01.ibm.com/support/docview.wss?uid=ibm10718835 ACKNOWLEDGEMENTS: None. CHANGE HISTORY: First Issued: Tue Aug 14 14:48:57 CDT 2018 =============================================================================== *The CVSS Environment Score is customer environment specific and will ultimately impact the Overall CVSS Score. Customers can evaluate the impact of this vulnerability in their environments by accessing the links in the Reference section of this Security Bulletin. Disclaimer According to the Forum of Incident Response and Security Teams (FIRST), the Common Vulnerability Scoring System (CVSS) is an "industry open standard designed to convey vulnerability severity and help to determine urgency and priority of response." IBM PROVIDES THE CVSS SCORES "AS IS" WITHOUT WARRANTY OF ANY KIND, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. CUSTOMERS ARE RESPONSIBLE FOR ASSESSING THE IMPACT OF ANY ACTUAL OR POTENTIAL SECURITY VULNERABILITY.